Web feeding mechanism



July 26, 1960 r A, F. PITYO 2,946,586

WEB FEEDING MECHANISM Filed Sept. 1-7, 1953 2 Sheets-Sheet 1 Fig.1. 4

IN V @N TOR. Albert EpLtI/O ,4 TTURNEY July 26, 1960 A. F. PITYO2,946,586

WEB FEEDING MECHANISM Filed Sept. 17 1953 I 2 Sheets-Sheet 2 mum!INVENTOR. Albert F. Pz'tqo.

' WWW WEB FEEDING MECHANISM Albert F. Pityo, Paterson, N J. (1384Pompton Ave., Cedar Grove, N .J

Filed Sept. 17, 1953, Ser. No. 380,685 3 Claims. 01. 271-24 My inventionrelates to web feeding mechanism.

An important object of the invention is to provide mechanism forintermittently feeding the web, in an accurate manner, regardless ofvariations in speed of or lost motion in the drive means. 7

A further object of the invention is to provide a dwell in the operationof the feed roll, while the companion roll is shifted from the feed rolland the clamping means rendered active.

A further object of the invention is to provide mechanism of the abovementioned character, all parts of which are driven from a continuouslyrotating element.

A further object of the invention is to provide mechanism of the abovementioned character which is adjustable to vary the length ofeachintermittent feed of the web.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawings forming a part of this application and inwhich like numerals are employed to designate like parts throughout thesame,

Figure 1 is a side elevation of web feeding machanism embodying myinvention,

Figure 2 is a plan view of the same.

Figure 3 is a vertical'section taken on line 3-3 of Figure 2,

Figure 4 is a vertical section taken on line 44 of Figure 2,

Figure 5 is a horizontal section taken on line 5--5 of Figure 1,

Figure 6 is a detailed section taken on line 6-6 of Figure 5.

In the drawings, where for the purpose of illustration is" shown apreferred embodiment of my invention, the numeral 1 designates astationary frame which is supported by any suitable means. This frameincludes sides 2 and 3, which are rigidly connected by an end 4 andbottom 5. The sides 2 and 3 have upstanding guides 6, having verticalopenings 7 formedtherein, receiving the reduced ends 8 of bearings 9.These bearings rotatably receive a horizontal upper rotatable transverseshaft 10, having an upper roll 11, rigidly secured thereto. Rigidlysecured to the vertical guides 6 by bolts 12 are caps 12. These capshave openings 13' formed therein, receiving compressible coil springs13, which bear against the extensions 8 of the bearings 9. The openings13 are closed at their tops by screw-threaded plugs 14', engagingtherein.

Arranged within the frame 1 beneath the upper roll 11 is a lower fixedroll 14, which extends longitudinally of the upper roll and is paralleltherewith. This lower roll is carried by a horizontal shaft 15,rotatable in fixed bearings 16, the roll 14 being rigidly mounted uponthe shaft 15. This roll 14 has a cut-away portion 17, forming an end 18,having a link 19 pivoted thereto at 19". This link is adjustablypivotally connected with a cam wheel 20. The cam-wheel 20 is providedupon its periphery with a lower cam face 21' and an upper cam face 22',connected by inclined shoulders 23". The camwheel 20 has a diametricallyextending recess 24', formed in its end. A block 25', is radiallyadjustably mounted Within the recess and has a screw-threaded opening26, for receiving an adjusting screw 27', which is swivelled upon acrosshead 28', rigidly mounted upon the camwheel 21'. The block 25carries a pivot element 29', connected with the link 19. By turning thescrew 27 the block 25' can be radially adjusted and the throw of thelink 19 adjusted. The cam-wheel 20 is rigidly mounted upon a horizontalshaft 30', journaled in a fixed bearing 31' and driven by a pulley 31The upper roll 11 is spring pressed toward the lower roll 14 by thesprings 13 and is moved from the lower roll 14 by a yoke 21, including along arm 22 and a short arm 23, rigidly connected by the end 32' of theyoke. This yoke is pivotally mounted upon a fixed pin 33', mounted uponthe sides 2 and 3, as shown. The arms 22 and 23 operate beneath thebearings 9, and serve to raise these bearings. The long arm 22 carries aroller 24, rotatably mounted thereon, and arranged to engage theperiphery of the cam-wheel 20, including cam faces 21' and 22'.

The yoke has an outwardly projecting extension 25, rigidly securedthereto, and beneath this extension is arranged a presser plate 25having beneath it a stationary presser plate 26, rigidly mounted uponthe frame end 4. The presser plate'25 is carried by slidable bolts 27,mounted in suitable openings in the extension 25, and the presser plateis moved downwardly by coil springs 28, as shown.

The operation of the mechanim is as follows:

The web W is fed forwardly to the right, Figures 1 and 3. The cam-wheel20 is rotated continuously clockwise, Figure 1. The feed roll 14 isintermittently turned in opposite directions. The link 19 reciprocatesthe roll 14 within the limits of the stroke of the roll 14, as indicatedby the lines S. As shown in Figure 1, the roller 24 is upon the low camface 21', and the cam-wheel 20 has turned for one-half of a revolutionin the direction of its arrow and the feed roll 14 has turnedclockwise,Figure 1 for the end of its feeding stroke. The upper roll 11 is nowpressing the web W against the lower roll 14, so that the lower roll hasfed the web to the right. The presser plate 25 is now raised. The roll24 now engages the leading shoulder 23', and fur ther turning movementof the cam-wheel 20 causes the roller to pass upon the high cam face22'. This movement of the roller 24 swings the yoke 21 upwardly, causingroll 11 to move from roll 14, relieving the pressure upon the web W,between the rolls 11 and 14. Simultaneously with this action, presserplate 25 is moved downwardly and clamps the web W against the lowerpresser plate 26. The web is now held against longitudinal movement ineither direction. During this operation, the roll 14 is turningcounter-clockwise, Figure 3, and will slide upon the web W. When theright hand line S is reached by the pivot 19, the pivot 29' is about tostart upon its travel beneath the shaft 30'. When the pivot 19' istravelling from the line S to the right to the line S to the left, theroll 14 is travelling clockwise, and will feed the web W to the right.At about the time that the pivot 29' reaches the horizontal position tothe right, Figure 3, the roller 24 will pass from the high cam face 22'to the low cam face 21, and roll 11 will again be lowered to press theweb W against the lower roll and the presser plate 25 raised to free theweb W.

The plate 25 starts to grip the web at about the end of the feedingstroke of the roll 14, and starts to grip the web shortly before the webis released from the roll 14 by the upward movement of the roll 11, andcon- Paizented July 26, 1960 tinues to grip the web during the entireback stroke or counter-clockwise movement of the roll 14. The link 19cannot perceptibly turn roll 14 when the pivot 29' has its centerpassing between lines L and L and be tween line L and line L This is twodistances of 2% At this time the roller 24 is travelling from one camface 21' to the other cam face 22' and hence there, is no perceptiblefeed of the web while the roller is passing over the shoulders 23. v

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarions changes in the shape, size, and arrangement of parts may beresorted to without departing from the spirit of my invention or thescope of the subjoined claims.

Having thus deseribed my invention, 1 claim:

1. Web feeding mechanism comprising a support, a feed roll journaledupon the support to oscillate with relation thereto, a rotary elementmounted upon the support and having high and low cam faces which areoppositely arranged circumferentially of the rotary element andshoulders connecting the high and low cam faces on opposite sides of theaxis of rotation of the rotary element and spaced substantiallyequidistantly from such axis of rotation, means to continuously rotatesaid element during the operation of the mechanism, a link, a pivotelement mounted upon the rotary element and connected with the link andarranged substantially midway between said shoulders and spaced from theaxis of rotation of the rotary element, a pivot element mounted upon thefeed roll and pivotally connected with the link, the arrangement beingsuch that the link produces a dwell of the feed roll when the pivotelement of the rotary element is substantially at dead center withrespect to the link and the axis of rotation of the rotary element, apresser roll arranged near and opposite said feed roll, movable meansfor shifting the presser roll toward and from the feed roll including an'arm having a part arranged to contact the high and low cam faces and toengage the shoulders when the first-named pivot element is substantiallyat dead center, and a web clamping device connected with the movablemeans and operated by the same, the arrangement being such that themovable means operates to shift the presser roll from or o ard h f d 191 du in the d ll 9 he fee 1011 nd w e i Pa t ng ge sa d shou de s- W e dn m c anism cmpris ng a uppor a cip y eb feedin element mo nte 1 92 theppo a r a y lement m un ed 1 93 114? suppor and having hig nd lo can; cewh ch a oppositely r an d c m e en al y o t e tary elemen and hou dersronnectin said c m t tic n op os t s e o the axis of rotation of therotary element and spaeed b tant a ly equ di tan y th r m a s o conti uously rotate the rotary element, a link, a pivot element carried by therotary element and connected with the link and spaced from the axis ofrotation of the rotary element and substantially equidistantly spacedfrom said shoulders, a pivot element earried by the reciprocatory webfeeding element and pivotally connected with the link, whereby the webfeeding element is caused to dwell when the first-named pivot element issubstantially at dead center with respeet to said link and the axis ofrotation of the rotary element, a presser roll arranged near and pposi et e eb feedin leme mo ab means for shifting the presser roll toward andfrom the web feeding element and including a pivoted part arranged tocontact said high and low cam faces and to engage d shoulde s hen thefirst-named ri e element is substantially at dead center with respect tothe link and axis of rotation of the rotary element, and a web clampingdevice connected with said movable means and operated thereby to clampand release the web when said pivoted .part of the movable means engagesthe shoulders, the movable means then serving tosliift the presser rollfrom or toward the web feeding element during the dwell of the webfeeding element."

3. Web feeding mechanism comprising a support, a reciprocatory webfeeding element mounted n'pon the support, a rotary element'mounted uponthe support in spaced relation to the web feeding element and havinghigh and low cam faces which are oppositely disposed circumferentiallyof the rotary element and' shoulders connecting said cam faces andarranged upon opposite sides of and substantially equidistantly spacedfrom the axis of rotation of the rotary elemfi i, means to rotate therotary element, a presser roll arranged near and opposite thereciprocatory web feeding element, movable'rneans to shift the presserroll toward and from the web feeding element and including a partcontacting the high and iow cam faces and adapted to ride over' saidshoulders, a web clamping device connected with the movable means andoperated thereby, and driving conneoting means between said rotaryelement and reciprocatory web feeding element and producing a dwell inthe latter when the driving connecting means is substantially on deadcenter with respect to the axis of rotation of the rotary element andsaid part of the movable means is engaging one of said shoulders,whereby the movable means is caused to shift the presser roll from ortoward the web feeding element during the dwell of the web feedingelement.

References Cited in the file of this patent UNITED STATES PATENTS

